Question about Sigma Sport BC506 Bike Computer

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The speed mph varies widely even when the bike is going at a consistent pac. The computer will read 3 mph and then jump to 20 mph which the bike is just rolling without a big variation in speed.

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Another cause could be that there is too much clearance between the sensor and magnet. Move the sensor up or down the fork and adjust the magnet to get a closer gap.

Posted on Mar 29, 2013

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The most likely cause is that the front wheel is a little loose. This causes the magnet on the spokes to pass the receiver on the bike frame at different distances. If it passes at more than 1 mm it won't be read so it is probably only reading some of the rotations of the wheel. The solution is to loosen the wheel and tighten the nuts inside the forks a little. When it's at the right tightness the weight of the wheel valve should be just able to turn the wheel until it reaches the bottom with the wheel raised off the ground. There should be very little or no sideways movement in the wheel. Also ensure that the magnet is not moving.

Posted on Jul 19, 2010

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